If I put a half dozen guitars in your hand with different fretboard radii you likely wouldn't notice any difference except at the most extreme ends of the spectrum. Yeah, a 7.5" and a 16" are going to feel a bit wonky next to each other. Going from a 9.5" to a 16"... eh, not so much. There's a really good diagram in this TDPRI thread that shows just how little real world difference there is:
https://www.tdpri.com/threads/string-height-and-understring-radius.730022/ Of course, feel is measured in hundredths of a millimeter but even for the most ridiculous of radius changes just give it fifteen minutes and you'll forget.
The real difference is in bent notes. A smaller radius will fret out sooner, sometimes making even a full step bend impossible. This is really why the compound radius was developed, as I understand it. The flatter the board up high, the more room there is for the string to vibrate when it's bent.
Another positive that's not often brought up is that a flatter radius up high allows you to use a flatter radius at the bridge. If you've ever tried to use a pick on a violin you know why that's a good thing.